Filling a suregrip rear with fluid ?

[Beer]

For a suregrip rear, its regular gear oil with the mopar suregrip friction fluid mixed in?  Is it 4 ounces to the rest gear oil?

The parts guy at the Dodge dealership was useless    ...he said I needed part numbers because his books do not go back to 73'  

[71superbee]

Sure-grip additive from your local Chrysler Dodge or Jeep dealer is part # 4318060AB and has a MSRP of 7.67 . I add two bottles of this and fill the rest with 80-90 gear oil.

[Beer]

Synthetic Ok for the gear oil?

[aifilaw]

I've used it on manual transmissions and it does a better longer-lasting job than regular gear oil. I don't see why it wouldn't be the same on the diffy

[RD]

synthetic gear oil does not require any additives to use with suregrip units.  you can use it straight.

*edit* royal purple is good, but expensive.. castrol synthetic or mobil one synthetic are good.

[alcusswhen]

I've used it on manual transmissions and it does a better longer-lasting job than regular gear oil. I don't see why it wouldn't be the same on the diffy

I've used this from Summit at $9.95 a bottle for 20 years now and no problems. Gear Lube, GL-6 Gear Oil, 75W140, Limited Slip, Synthetic, 1 qt., Each

Put Part Number: RMG-LUBE in summits key word search.